Beat-wave excitation of plasma wave and observation of accelerated electrons

Kitagawa, Yoneyoshi; Matsumoto, T.; Minamihata, T.; Sawai, K.; Matsuo, Kazuki; Mima, Kunioki; Nishihara, Katsunobu; Azechi, H.; Tanaka, K. A.; Takabe, H.; Nakai, S.

doi:10.1103/physrevlett.68.48

Cited by 207 publications

(51 citation statements)

References 14 publications

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“…• Plasma beat-wave acceleration (PBWA): Two conventional long pulse (∼100 ps) modest intensity lasers (I ∼ 10 14 -10 16 [Wcm producing plasma with a precise value electron density [27].…”

Section: Introductionmentioning

confidence: 99%

Efficient simulation of electron trapping in laser and plasma wakefield acceleration

2010

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EngineeringPlasma based laser Wakefield accelerators (LWFA) have been a subject of interest in the plasma community for many years. In LWFA schemes the laser pulse must propagate several centimeters and maintain its coherence over this distance, which corresponds to many Rayleigh lengths. These Wakefields and their effect on the laser can be simulated in the quasistatic approximation. The 2D, cylindrically symmetric, quasistatic simulation code, WAKE is an efficient tool for the modeling of short-pulse laser propagation in under dense plasmas [P. Mora & T.M. Antonsen Phys. Plasmas 4, 1997]. The quasistatic approximation, which assumes that the driver and its wakefields are undisturbed during the transit time of plasma electrons, through the pulse, cannot, however, treat electron trapping and beam loading.Here we modify WAKE to include the effects of electron trapping and beam loading by introducing a population of beam electrons. Background plasma electrons that are beginning to start their oscillation around the radial axis and have energy above some threshold are removed from the background plasma and promoted to "beam" electrons. The population of beam electrons which are no longer subject to the quasistatic approximation, are treated without approximation and provide their own electromagnetic field that acts upon the background plasma. The algorithm is benchmarked to OSIRIS (a standard particle in cell code) simulations which makes no quasistatic approximation. We also have done simulation and comparison of results for centimeter scale GeV electron accelerator experiments from LBNL. These modifications to WAKE provide a tool for simulating GeV laser or plasma wakefield acceleration on desktop computers.

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Section: Introductionmentioning

confidence: 99%

Efficient simulation of electron trapping in laser and plasma wakefield acceleration

2010

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“…The method was proposed by Tajima and Dawson [4] as an alternative to the LWFA due to the unavailability of short (≤ 1 ps), intense (> 10 17 W/cm 2 ) lasers at that time. In 1992, Kitagawa and coworkers [14] observed the acceleration of background electrons via PBWA employing two lines of a CO 2 laser. The total electron energy gain was 10 MeV and a 1.5 GV/m accelerating gradient was measured.…”

Section: Plasma Based Accelerator Experimentsmentioning

confidence: 99%

Control of Laser Plasma Based Accelerators up to 1 GeV

Nakamura

2007

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This dissertation documents the development of a broadband electron spectrometer (ESM) for GeV class Laser Wakefield Accelerators (LWFA), the production of high quality GeV electron beams (e-beams) for the first time in a LWFA by using a capillary discharge guide (CDG), and a statistical analysis of CDG-LWFAs.An ESM specialized for CDG-LWFAs with an unprecedentedly wide momentum acceptance, from 0.01 to 1.1 GeV in a single shot, has been developed. Simultaneous measurement of e-beam spectra and output laser properties as well as a large angular acceptance (> ±10 mrad) were realized by employing a slitless scheme. A scintillating screen (LANEX Fast back ,LANEX-FB) -camera system allowed faster than 1 Hz operation and evaluation of the spatial properties of e-beams. The design provided sufficient resolution for the whole range of the ESM (below 5% for beams with 2 mrad divergence).The calibration between light yield from LANEX-FB and total charge, and a study on the electron energy dependence (0.071 to 1.23 GeV) of LANEX-FB were performed at the Advanced light source (ALS), Lawrence Berkeley National Laboratory (LBNL). Using this calibration data, the developed ESM provided a charge measurement as well.The production of high quality electron beams up to 1 GeV from a centimeter-scale ii accelerator was demonstrated. The experiment used a 310 µm diameter gas-filled capillary discharge waveguide that channeled relativistically-intense laser pulses (42 TW, A statistical analysis of the CDG-LWFAs' performance was carried out. By taking advantage of the high repetition rate experimental system, several thousands of shots were taken in a broad range of the laser and plasma parameters. An analysis program was developed to sort and select the data by specified parameters, and then to evaluate performance statistically.The analysis suggested that the generation of GeV-level beams comes from a highly unstable and regime. By having the plasma density slightly above the threshold density for self injection, 1) the longest dephasing length possible was provided, which led to the generation of high energy e-beams, and 2) the number of electrons injected into the wakefield was kept small, which led to the generation of high quality (low energy spread) e-beams by minimizing the beam loading effect on the wake. The analysis of the stable half-GeV beam regime showed the requirements for stable self injection and acceleration. A small change of discharge delay t dsc , and input energy E in , significantly affected performance.The statistical analysis provided information for future optimization, and suggested possible schemes for improvment of the stability and higher quality beam generation. A CDG-LWFA is envisioned as a construction block for the next generation accelerator, enabling significant cost and size reductions.

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“…There are several acceleration schemes in plasma based accelerators which work on the same principle. These schemes are laser wake field accelerator (LWFA) [8], plasma wake field accelerator (PWFA) [9], plasma beat wave accelerator (PBWA) [10][11][12], self-modulated laser wake field accelerator (SM-LWFA) [13][14][15] and wake field accelerators driven by multiple electron or laser pulses [16]. Among these schemes, the LWFA was introduced for the first time.…”

Section: Introductionmentioning

confidence: 99%

Simulation study of wake field excitation in interaction of intense laser and magnetized plasma: Half-sine pulse shape (HSPS) and trapezoid pulse shape (TPS)

Rahimian¹,

Zahed²

2017

Lith. J. Phys.

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We have conducted particle-in-cell (PIC) simulations of a linearly polarized intensive laser pulse with two different envelopes propagating through a homogeneous fully ionized cold plasma. It is shown that the amplitude of the wake field depends on laser wavelength, pulse duration, electron number density and envelope shape. We have also simulated the effect of applying a longitudinal magnetic field on the wake field excitation process. It is observed that magnetic field enhances the wake field and increases its intensity in all cases. Our results are in agreement with the analytical results presented by Askari and Shahidani [Opt. Laser Technol. 45, 613-619 (2013)] and can help choosing the optimum values of affecting laser and plasma parameters in order to reach high accelerating wake electric fields.keywords: laser pulse, wake field excitation, particle-in-cell (PIC), magnetized plasma pacS: 02.60. Cb, 52.25.Xz, 52,

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Beat-wave excitation of plasma wave and observation of accelerated electrons

Abstract: Matsumoto, T.; Minamihata, T.; Sawai, K.; Matsuo, K.; Mima, K.; Nishihara, K.; Azechi, H.; Tanaka, K.A.; Takabe, H.; Nakai, S. Citation Physical Review Letters. 68(1) P.

Cited by 207 publications

References 14 publications

Efficient simulation of electron trapping in laser and plasma wakefield acceleration

Efficient simulation of electron trapping in laser and plasma wakefield acceleration

Control of Laser Plasma Based Accelerators up to 1 GeV

Simulation study of wake field excitation in interaction of intense laser and magnetized plasma: Half-sine pulse shape (HSPS) and trapezoid pulse shape (TPS)

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